ARM: dts: msm: Add MHI and PCIe configuration

Additional config added to LE CPE platform

Depends-on: 2875186
Change-Id: I658568988e80f1c538d02b77cc8771951d4d585e
Acked-by: Gajendra Singh <gajendra@qti.qualcomm.com>
Signed-off-by: Signed-off-by: Aman Gupta <amangupt@codeaurora.org>